What is the equation of this graphed line?

This is different from the first one can someone me

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2

David and alton are training for a race. they spend 35 minutes stretching and then go on a 5 mile practice run. david runs at a pace of 7 min/mile. alton runs at a pace of 8 min/mile. write an equation for each runner that shows the total length of their workout. then solve each equation showing your work